Add row-gap to the TitleWithMetadataWrapper class to add vertical spacing between title and metadata

Author: billycai

polaris-react/src/components/Page/components/Header/components/Title/Title.scss

@@ -28,6 +28,7 @@
   display: flex;
   flex-wrap: wrap;
   align-items: center;
+  row-gap: var(--p-space-2);
 
   .Title {
     display: inline;